I just reinstalled a voltage regulator (VR) got good readings, car was running great so, I wanted to drive it for testing. Put it in reverse, moved 1 foot and died. Nothing from the key, no lights, no fuel pump. Still reads 12.5 volts. When I pushed the starter solenoid (SS), it kept grinding the starter. Another push would not stop the starter. When I tried to undo the nuts on the SS, it sparked and quit grinding the starter. Since everything else was dead, it would not start. Now, when I press the SS once, it just cranks once, like it is supposed to do. I still get 12.5 V when reading at the SS but, only read 9 V when reading the B post of the VR, to ground. Before the car died, I was reading 12.5 V at the B post of the VR. I put the old VR on and, still get nothing better. The #1 and # 6 fuses read 12.5 V in and going out, with the car not running, as they are supposed to read. The 1956 XK-140 OTS has had a Pertronix electronic ignition for the past year, with no problems, and an auxillary fan for heating issues with no problems.
So, what has happened to cause this?? Desperate in Florida!!